Experiment	Measurement	Reference
Belle	\([3.29 \pm 0.29\mbox{ (stat)} \pm 0.19\mbox{ (syst)}] \times 10^{-4}\)	Phys. Rev. D 93, 052016 (2016)
Average	\(\mathbf{[3.29 \pm 0.35\mbox{ (combined)}] \times 10^{-4}}\)